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Modified sodium silicate binder for cold core box and preparation thereof

A technology of glass binder and modified water, which is applied in the direction of mold cores, manufacturing tools, casting molding equipment, etc., can solve the problems of mixing resin sand core sand and water glass old sand, affecting the regeneration quality of old sand, and achieving Good collapsibility, improved working environment, and the effect of preventing hot crack defects

Active Publication Date: 2012-10-10
SHENYANG HYATON FOUNDRY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, there are environmental protection problems, and at the same time, there is a problem of mixing resin sand core sand and sodium silicate old sand, which affects the quality of old sand regeneration.

Method used

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  • Modified sodium silicate binder for cold core box and preparation thereof
  • Modified sodium silicate binder for cold core box and preparation thereof
  • Modified sodium silicate binder for cold core box and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]Dissolve 4g of industrial aluminum hydroxide and 4g of industrial zinc hydroxide into 10g of 40% sodium hydroxide aqueous solution to make an intermediate aqueous solution of modifier, industrial solid sodium silicate, solid-1 type 330g, and then industrial hydroxide Potassium 13g, industrial sodium hydroxide 54g, modifier intermediate aqueous solution 18g, tap water 350g, put into a 2L high-pressure reactor, cover and seal, start stirring, slowly heat up to 158°C, keep warm for 6h, naturally cool to room temperature, precipitate for 48h, Uncap to obtain water glass of the present invention, be denoted as A1, and list in Table 1.

Embodiment 2

[0045] Dissolve 2g of industrial aluminum hydroxide and 4g of industrial zinc hydroxide into 7g of 40% sodium hydroxide aqueous solution to make an intermediate aqueous solution of modifier, then industrial solid sodium silicate, 300g of solid-2 type, industrial hydroxide Potassium 55g, industrial sodium hydroxide 27g, sorbitol 4g, xylitol 10g, modifier intermediate aqueous solution 13g, tap water 398g, add to a 2L autoclave, cover and seal, start stirring, slowly heat up to 160°C, keep warm for 8h , naturally cooled to room temperature, precipitated for 72h, and opened the lid to obtain water glass of the present invention, which was recorded as A2 and listed in Table 1.

Embodiment 3

[0047] Dissolve 10g of industrial aluminum hydroxide and 20g of industrial zinc hydroxide into 33g of 40% sodium hydroxide aqueous solution to make an intermediate aqueous solution of the modifier, and then add industrial solid sodium silicate, solid-3 type 300g industrial solid silicic acid Potassium 34g, industrial potassium hydroxide 42g, industrial sodium hydroxide 15g, sorbitol 20g, xylitol 20g, glycerin 20g, modifier intermediate aqueous solution 63g, tap water 475g, add 2L autoclave, cover and seal, start stirring, Slowly raise the temperature to 165°C, keep it warm for 5 hours, cool naturally to room temperature, and precipitate for 48 hours. The water glass of the present invention is obtained after opening the lid, which is recorded as A3 and listed in Table 1.

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Abstract

The invention aims to provide a modified sodium silicate binder for a cold core box and a preparation method thereof. The binder has the advantages of wide raw material sources, no toxicity or smell and good mechanical property and is applicable to mechanized core manufacture of the cold core box and manual core manufacture. The modified sodium silicate binder comprises the following chemical compositions in percentage by mass: 20 to 30 percent of SiO, 10 to 20 percent of Na2O, 0.5 to 19 percent of K2O, 1.0 to 20 percent of modifier and the balance of water, wherein the modifier can be aluminium hydroxide and / or zinc hydroxide, or one or more of amylin, sugar, molasses, polyacrylamide, sodium polyacrylate, sodium tripolyphosphate, cellulose, humic acid, sodium humate, sorbierite, xylitol and sodium silicate are added.

Description

technical field [0001] The invention relates to molding materials for casting technology in the equipment manufacturing industry, and in particular provides a modified water glass binder for cold boxes and a preparation method thereof. Background technique [0002] Equipment manufacturing industry is the pillar industry of our country, and casting is the basic industry of equipment manufacturing industry. High-efficiency core-making technology is a common technology in the equipment manufacturing industry. This technology is closely related to casting production cost, production efficiency, casting quality, working conditions, and environmental protection. High-efficiency core-making technologies include: hot box, shell core, and cold box. Hot core boxes and shell cores belong to the thermal process, which consumes high energy and has poor working conditions, so the scope of application is gradually narrowing. In 1968, the urethane cold box technology came out. Due to its ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/18
Inventor 余明伟
Owner SHENYANG HYATON FOUNDRY MATERIAL
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